{"id":"F2009L02769","name":"AD/CL-600/86 - Nose Landing Gear(NLG) and NLG Door Selector Valves - CANCELLED","slug":"ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":79921,"registerId":"commonwealth-F2009L02769-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/86 - Nose Landing Gear(NLG) and NLG Door Selector Valves - CANCELLED","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\ntitle: AIRCRAFT\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n \n\nAIRWORTHINESS DIRECTIVE\n\nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/CL-600/86.\n\n### Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n| AD/CL-600/86 | Nose Landing Gear(NLG) and  NLG Door Selector Valves | 8/2009 |\n| --- | --- | --- |\n\n\n \n\n| Requirement: | CANCELLED. |\n| --- | --- |\n|  | This AD is cancelled on 30 July 2009. |\n| Background: | This AD has been superseded by AD/CL-600/111. |\n\n\n![](image.001.png)\n\nJames Coyne  Delegate of the Civil Aviation Safety Authority\n\n19 June 2009\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1615},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument performs exactly the administrative function intended: cancelling a superseded airworthiness directive when a replacement directive takes effect. There is no expansion beyond the original scope of maintaining aircraft safety standards."},"complexity_factors":["Single operative provision (cancellation of previous directive)","No defined terms or interpretation section","No conditional logic, exceptions, or procedural requirements","Only one cross-reference (to the replacement directive AD/CL-600/111)"],"plain_english_summary":"**What this does:** Cancels an older safety rule (Airworthiness Directive AD/CL-600/86) that required specific actions regarding the nose landing gear and door selector valves on Bombardier CL-600 Challenger aircraft.\n\n**Who it affects:** Owners and operators of Bombardier (Canadair) CL-600 series aeroplanes.\n\n**What you need to know:**\n* You no longer need to comply with the old directive (AD/CL-600/86).\n* A new directive (**AD/CL-600/111**) now covers these safety requirements instead.\n* This is essentially housekeeping—removing an obsolete rule that has been fully replaced by an updated version.\n\n**Why it matters:** This ensures the official safety rules stay current. The cancelled directive related to critical components (nose landing gear valves) that control how the aircraft's front wheel extends and retracts, so maintaining the correct safety standards—now under the new directive—is essential for flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled","history":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled/history","analysis":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled/analysis","conflicts":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled/conflicts","importantCases":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled/important-cases","documents":"/api/acts/ad-cl-600-86-nose-landing-gear-nlg-and-nlg-door-selector-valves-cancelled/documents"}}